What if cities and architecture behaved like living organisms again? Nature-Based Regeneration invites a holistic, thoughtful, site-specific practice-from the construction detail to the neighbourhood, "from the spoon to the city." It revives the common sense of vernacular architecture-attentive to climate, soils, water, and materials-and weaves it with the social and cultural textures of place, embracing a more-than-human approach that puts people and other species on the same map while facing climate challenges with contemporary tools. Through five European stories-Barcelona, Copenhagen, Paris, Montpellier, Rønde-the book offers not icons but living prototypes: green networks as urban stitching, porous architectures that breathe, habitat facades, roof gardens, sponge courtyards, living soils, and blue-green infrastructure that make the city cooler, more livable, and generative. The result is a simple, transferable method: listening and co-design, in-situ testing, appropriate materials, and shared stewardship to reconnect environment and society. The volume closes with practical tools-guidelines, key questions, and project sheets-to help public agencies, designers, and communities shape concrete, beautiful, and just interventions, starting from what each place already knows.